发表机构
University of Tehran; Centro Brasileiro de Pesquisas Fısicas（德黑兰大学; 巴西物理研究中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文采用LOCV方法，结合Reid68和AV₁₈相互作用及三体力，研究非对称核物质中质子和中子的单粒子势与有效质量，分析其对动量等的依赖，相关结果为非对称核物质提供了微观状态相关单粒子势。
AI 中文摘要
本文采用最低阶约束变分（LOCV）方法，研究非对称核物质中质子和中子的单粒子势与有效质量，利用Reid68和AV₁₈核子-核子相互作用，还考察了三体力的影响，分析这些量对动量、密度和同位旋不对称度的依赖关系。随着不对称度增加，中子和质子的单粒子势呈现系统分裂，将其分解为不同相互作用通道后，可确定介质中相互作用的主导贡献。对称势随动量增加而减小，且对密度和三体力有显著依赖，尤其在低动量区域；中子-质子有效质量分裂随不对称度增大而增加，其中子有效质量大于质子有效质量。本文还将计算得到的对称势与其他微观、唯象方法的结果，以及经实验约束的Lane势进行对比，发现其随动能增加的减小趋势一致。这些结果为非对称核物质提供了微观的、与状态相关的单粒子势，其对动量、密度和不对称度的依赖直接由 underlying 两体和三体相互作用确定。
英文摘要
The single-particle potentials and effective masses of protons and neutrons in asymmetric nuclear matter are investigated within the lowest-order constrained variational (LOCV) method. The dependence of these quantities on momentum, density, and isospin asymmetry is studied using the $Reid68$ and $AV_{18}$ nucleon-nucleon interactions, with the effects of three-body forces also examined. The neutron and proton single-particle potentials exhibit a systematic splitting with increasing asymmetry, while their decomposition into different interaction channels identifies the dominant contributions to the in-medium interaction. The symmetry potential decreases with increasing momentum and shows a pronounced dependence on density and three-body forces, particularly at low momentum. The neutron-proton effective-mass splitting increases with asymmetry, with the neutron effective mass larger than the proton effective mass. The calculated symmetry potential is also compared with results from other microscopic and phenomenological approaches and with the empirically constrained Lane potential, showing a consistent decreasing trend with increasing kinetic energy. These results provide a microscopic, state-dependent single-particle potential for asymmetric nuclear matter, with its momentum, density, and asymmetry dependence determined directly from the underlying two and three-body interactions.
Comments14 pages, 13 figures
